Which best describes the digestive classification of horses?

• A. Foregut fermenter
• B. Hindgut fermenter
• C. Pseudo Ruminant
• D. Monogastric

Answer: (B)

Where fermentation happens defines how a herbivore digests fiber and derives energy. Horses have a simple stomach (monogastric), but most of their microbial digestion of fibrous plant material occurs in the hindgut—the cecum and large intestine. Microbes in this region break down fiber and produce volatile fatty acids that the horse can absorb, which is why they’re classified as hindgut fermenters.

Foregut fermenters, like cattle, ferment in the rumen before the true stomach, which is a different setup that also allows rumination. Pseudo ruminants refer to animals with a ruminant-like stomach that isn’t truly ruminant. While a horse is monogastric in stomach anatomy, the defining feature for this question is the site of fermentation, making hindgut fermentation the best descriptor.